I need to make sure I understand perfectly the high-Z state and its relation to voltage.I intend to explain what I have understood based on three example, is there something wrong ?
If the LED is red, the point 1 will approximatively be at 1.3 V because the voltage drop across a RED LED is approximatively 2 V.
Point 4 is at high-Z so we do not know its voltage. Can we assume it is near 1.3 V, or can it really be anything ? If I measure it with a voltmeter I would get around 1.3 V, but it is because the voltmeter is injecting a small current resulting in measuring the LED's resistor value ?
Point 3 is at high-Z as well. But is point 2 considered at high-Z ? It is not really an unconnected wire as it is connected to a resistor. More generally, if we replace the resistor with any other passive component, would 2 be at high-Z or no ?